[amd64/g++] Suspected toolchain bug causing dlopen to segfault

[Yann Dirson <ydirson@free.fr>]

Hello,

Context:

http://bugs.debian.org/734318 - tulip: [amd64] segfaults inside dlopen when loading plugins
http://bugs.debian.org/723982 - dlopen: segfaults right inside call_init

What we get here is a number of plugins that when dlopen'd cause an
obscure segfault inside libc code.  Upstream (CC'd) say they have
heard of such problems (on Ubuntu 13.10), that people have worked
around by downgrading the compiler.

This sounds like either a toolchain regression, or possibly some
edge-case that worked by chance with old compilers and now fail.

Any insights ?

Best regards,
-- 
Yann